So the problem you see below can be solved in several ways.

Should this issue be reported to you again the first level of support you could do is as follows:

1. Server Sync side.

• Connect to the SyncServer from Node1 to NodeN depending on how many nodes there are. 
• Run Stop of SyncServer solutions via this button.
• Once the stop is executed restart all the SyncServer macmins in your constellation.
  • N.B: If the solutions do not stop within 3 to 5 minutes directly restart the macmini.

2. Filemaker Server side.

If the time is still incorrect after restarting the SyncServers 

• Connect to the Filemaker Server of the node where the time is incorrect. 
• Go to Configuration-->Script&Schedules --> if you see something like the attached screenshot you have to execute the following commands from the terminal.